Practicing programming is never useless. Especially problems that are often parts of interviews. Reviewing basic data structures and algorithms and refreshing

Practicing programming is never useless. Especially problems that are often parts of interviews. Reviewing basic data structures and algorithms and refreshing your memory with whatever languages you expect to have to deal with would be good practice even if you didn't do interviews. You say you are looking for a high paying job which means being flexible and capable with programming over a broad range of ideas and topics is something you need to be able to do. However it does not mean it is necessary, there are other ways to prove yourself and not every high paying job is going to do a coding interview.